JP2018102379A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine capable of achieving improvement in detergency.SOLUTION: A washing machine 1 includes: a washing tub 4; a first rotary vane 6 provided at a bottom 4A of the washing tub 4; a guide passage 37 for guiding a detergent to a space S between a bottom wall 17 and the first rotary vane 6; a water pumping passage 38 for pumping a washing liquid in the washing tub 4 from the space S and returning it to the washing tub 4; a second rotary vane 7 arranged in the space S; a motor 5; a water supply part 43; and a control part. After inputting a detergent in the guide passage 37, by supplying water smaller than a specified amount by the water supply part 43, the control part performs concentrated washing in which a concentrated washing liquid in which the detergent is dissolved to predetermined concentration is generated in the space S, and the first rotary vane 6 and the second rotary vane 7 are rotated by the motor 5. The first rotary vane 6 agitates laundry Q in the washing tub 4 by rotating. The second rotary vane 7 delivers the washing liquid in the space S to the water pumping passage 38 by rotating faster than the first rotary vane 6.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a washing machine.

  The washing machine described in Patent Literature 1 below includes a washing tub, a first rotating blade provided at the bottom of the washing tub, and a second rotating blade provided between the bottom of the washing tub and the first rotating blade. Including the pumping channel. A 1st rotary blade agitates the laundry in a washing tub by rotating. The second rotary blade rotates to feed the washing liquid in the washing tub from the bottom of the washing tub to the pumping path. The pumping path draws up the washing liquid fed by the second rotary blade and returns it to the washing tub. The laundry in the washing tub is washed by being agitated by the first rotating blades or being washed with a washing liquid from the pumping path.

JP2015-62582A

  In a washing machine, improvement in detergency is always required.

  The present invention has been made under such a background, and an object thereof is to provide a washing machine capable of improving the cleaning power.

  The present invention has a laundry input port and a bottom wall facing the input port from the lower side, stores the laundry input from the input port, and stores the washing liquid from the bottom wall side. A washing tub, a first rotary blade provided at the bottom of the washing tub and configured to rotate to stir the laundry in the washing tub; and extending downward in the washing tub; and the bottom in the washing tub A conduit for guiding the detergent to the space between the wall and the first rotor blade, and a pumping path provided in the washing tub for pumping the washing liquid in the washing tub from the space and returning it to the washing tub A second rotary blade that is disposed in the space and rotates at a higher speed than the first rotary blade to feed the washing liquid in the space into the pumping path, and the first rotary blade and the second rotary blade. A motor to rotate, and water supply to the washing tub And by supplying water less than a specified amount by the water supply unit after the detergent is introduced into the conduit, the concentrated laundry liquid in which the detergent is dissolved to a predetermined concentration is generated in the space, and then the motor is used. And a control unit that performs concentration cleaning for rotating the first rotary blade and the second rotary blade.

  In addition, the present invention further includes a detection unit that detects the number of rotations of the motor, and when the number of rotations of the motor during the concentration cleaning does not increase to a specified number of rotations, the control unit is controlled by the water supply unit. It is characterized by additional water supply.

  Further, in the present invention, when the rotation speed of the motor during the concentration cleaning after the additional water supply does not increase to the specified rotation speed, the control unit stops the concentration cleaning, and the washing tub After the additional water is supplied by the water supply unit until the amount of water reaches the specified amount, normal cleaning is performed by rotating the first rotary blade and the second rotary blade by the motor.

  Further, according to the present invention, when the rotation speed of the motor during the concentration cleaning increases to a specified rotation speed, the control unit performs the cleaning without performing the normal cleaning after continuing the concentration cleaning for a predetermined time. The process is terminated.

  According to the present invention, in the washing tub of the washing machine, the first rotary blade is provided at the bottom, and the second rotary blade is disposed in the space between the bottom wall of the laundry tub and the first rotary blade. In relation to the washing tub, there are a conduit for guiding the detergent to the space between the bottom wall and the first rotor blade, and a pumping channel for pumping the washing liquid in the washing tub from the space and returning it to the washing tub. Provided. In the washing machine, after the detergent is introduced into the conduit and reaches the space between the bottom wall and the first rotor blade, water is supplied in a smaller amount than the specified amount, so that the detergent dissolves to a predetermined concentration in this space. A concentrated laundry solution is produced. Thereafter, the first rotating blade and the second rotating blade are rotated by the motor, whereby the laundry is concentrated and washed. In the concentration cleaning, the laundry in the laundry tub is agitated by the rotation of the first rotary blade, so that the laundry is cleaned. Furthermore, the laundry in the washing tub is circulated while vigorously circulating the concentrated washing liquid through the pumping path by feeding the concentrated washing liquid to the pumping path by the second rotating blade rotating at a higher speed than the first rotating blade. The laundry is strongly washed with the concentrated washing liquid. As a result, the cleaning power can be improved.

  Further, according to the present invention, when the laundry in the washing tub becomes the resistance of the first rotary blade, and the rotational speed of the motor during the concentration cleaning does not increase to the specified rotational speed, the rotation of the second rotary blade is performed. Since the number does not rise, it is difficult to circulate the concentrated washing liquid vigorously and put it on the laundry. In this case, additional water is supplied into the washing tub. Then, the water level in the washing tub rises in a range where the concentration of the detergent in the concentrated laundry liquid does not drop more than necessary, thereby floating the laundry and reducing the resistance of the first rotary blade. Therefore, since the second rotary blade can be rotated at a high speed by increasing the rotation speed of the motor during the concentration cleaning to a specified rotation speed, the concentrated washing liquid can be circulated vigorously and put on the laundry. As a result, even if the initial resistance of the first rotary blade is excessive due to a large amount of laundry in the washing tub, the cleaning power can be improved.

  Further, according to the present invention, if the rotation speed of the motor during the concentration cleaning does not increase to the specified rotation speed even after the additional water supply, when the additional water supply is performed, the concentrated laundry liquid is the concentrated laundry liquid. It will be diluted to a normal concentration that can not be said. In this case, after the concentration cleaning is stopped and additional water is supplied until the amount of water in the washing tub reaches a specified amount, the first rotary blade and the second rotary blade rotate. As a result, the laundry can be normally washed with stirring by the rotation of the first rotary blade or with the washing liquid in which the detergent is dissolved to the normal concentration.

  Further, according to the present invention, when the rotation speed of the motor during the concentration cleaning is increased to the specified rotation speed, after the concentration cleaning is continued for a predetermined time, the cleaning process is terminated without performing the normal cleaning. As a result, water can be saved in the washing process, and even with a small amount of water supply, the maximum washing power can be exhibited by the concentrated washing.

FIG. 1 is a schematic longitudinal sectional view of a washing machine according to an embodiment of the present invention. FIG. 2 is a block diagram showing an electrical configuration of the washing machine. FIG. 3 is a flowchart showing processing executed in the washing machine. FIG. 4 is a flowchart showing a washing process executed in the washing machine.

  Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view of a washing machine 1 according to an embodiment of the present invention. When referring to the direction of the washing machine 1, the posture of the washing machine 1 in FIG. That is, the up and down direction in FIG. 1 is the up and down direction of the washing machine 1, and the left and right direction in FIG. 1 and the direction perpendicular to the paper surface in FIG. The washing machine 1 includes a box-shaped housing 2, a water tub 3, a washing tub 4, a motor 5, a first rotating blade 6, a second rotating blade 7, a guide portion 8, and a cover portion 9 disposed in the housing 2. Including.

  On the upper surface of the housing 2, an entrance 10 for taking in and out the laundry Q and a door 11 for opening and closing the entrance 10 are provided. The water tank 3 is a so-called outer tank and is elastically supported by the housing 2. The water tank 3 integrally includes a cylindrical side wall 12 having a central axis J extending in the vertical direction and a disk-shaped bottom wall 13 extending in the horizontal direction and closing the lower end of the side wall 12, and made of, for example, resin. . At the upper end of the water tank 3, an opening 14 is formed which is partitioned by the upper end edge of the side wall 12 and faces the entrance 10 from below. A through hole 15 is formed at the center of the bottom wall 13.

  Hereinafter, a circumferential direction around the central axis J is referred to as a circumferential direction P, and a radial direction around the central axis J is referred to as a radial direction R. The circumferential direction P and the radial direction R are both horizontal directions along the lateral direction. Of the radial direction R, a direction approaching the central axis J is referred to as a radial inner side R1, and a direction away from the central axis J is referred to as a radial outer side R2.

  The washing tub 4 is a so-called inner tub. The washing tub 4 is formed in a cylindrical shape that is slightly smaller than the water tub 3 and is accommodated coaxially in the water tub 3. The washing tub 4 integrally includes a cylindrical side wall 16 having a central axis line that coincides with the central axis line J, and a disk-shaped bottom wall 17 that extends in the horizontal direction and closes the lower end of the side wall 16, and is made of, for example, metal. It is. The lower end portion of the side wall 16 and the bottom wall 17 constitute a bottom portion 4 </ b> A of the washing tub 4. At the upper end of the washing tub 4, an input port 18 is formed which is partitioned by the upper edge of the side wall 16 and faces the opening 14 of the water tub 3 from below. When the user opens the door 11, the door 10, the opening 14, and the inlet 18 of the housing 2 are opened upward in a state where they are aligned in the vertical direction. As a result, the user can put the laundry Q into the laundry tub 4 and take out the laundry Q in the laundry tub 4 through the doorway 10, the opening 14, and the insertion port 18. A number of through holes (not shown) are formed in the side wall 16. A balance ring 19 in which a liquid for balancing the rotation of the washing tub 4 is accommodated at the upper end of the side wall 16 may be attached. In that case, the area surrounded by the balance ring 19 is the inlet 18. In the washing tub 4, the bottom wall 17 facing the input port 18 from below is formed with a through hole 20 in the center thereof, and a plurality of through holes 21 are formed around the through hole 20 in the circumferential direction P. Is done.

  In relation to the water tank 3 and the washing tub 4, the washing machine 1 includes a water supply path 22 and a drainage path 23. A water supply port 22A that faces the inside of the washing tub 4 is formed at one end of the water supply channel 22, and the other end of the water supply channel 22 is connected to a faucet (not shown). A water supply valve 24 that can be opened and closed is provided in the middle of the water supply path 22. When the water supply valve 24 is opened, tap water from the faucet flows through the water supply path 22 and is supplied into the washing tub 4 from the water supply port 22A. The tap water or water mixed with a detergent as will be described later is hereinafter referred to as a washing liquid. The washing liquid is stored in the washing tub 4 from the bottom wall 17 side. The washing liquid passes through a through hole (not shown) in the side wall 16 and a through hole 21 in the bottom wall 17 and moves back and forth between the water tub 3 and the washing tub 4. Water at the water level accumulates. One end of the drainage channel 23 is connected to the bottom wall 13 of the water tank 3, and the other end of the drainage channel 23 is drawn out of the machine. A drain valve 25 that can be opened and closed is provided in the middle of the drain channel 23. When the drain valve 25 is opened, the washing liquid in the water tub 3 and the washing tub 4 flows through the drain passage 23 and is discharged outside the apparatus.

  The motor 5 is an electric motor and is disposed below the bottom wall 13 of the water tank 3. The motor 5 has a drive shaft 27 protruding upward, for example. A clutch mechanism 28 having a known configuration is connected to the drive shaft 27. A first output shaft 31, a second output shaft 32, and a third output shaft 33 are connected to the clutch mechanism 28 for receiving and outputting the driving force generated by the motor 5 from the driving shaft 27. The clutch mechanism 28 can transmit or block the driving force of the motor 5 to each of the first output shaft 31, the second output shaft 32, and the third output shaft 33.

  The first output shaft 31 is formed in a cylindrical shape having a central axis that coincides with the central axis J. The first output shaft 31 extends upward from the clutch mechanism 28 and is inserted into the through hole 15 in the bottom wall 13 of the water tub 3 and the through hole 20 in the bottom wall 17 of the washing tub 4. The upper end portion 31 </ b> A of the first output shaft 31 protrudes above the bottom wall 17 and is disposed in the washing tub 4. The second output shaft 32 is formed in a circular tube shape having a central axis that coincides with the central axis J. The second output shaft 32 extends upward from the clutch mechanism 28 in a state of surrounding the first output shaft 31 and is inserted into the through hole 15 and the through hole 20. An upper end portion 32 </ b> A of the second output shaft 32 protrudes above the bottom wall 17 and is disposed in the washing tub 4. The upper end portion 31A of the first output shaft 31 is disposed so as to protrude above the upper end portion 32A.

  The third output shaft 33 is arranged in a cylindrical shape having a central axis line that coincides with the central axis line J, and the outer peripheral surface and the inner peripheral surface thereof may be expanded or contracted at a plurality of positions in the vertical direction. Good. The third output shaft 33 extends upward from the clutch mechanism 28 in a state of surrounding the first output shaft 31 and the second output shaft 32 and is inserted into the through hole 15. An upper end portion 33 </ b> A of the third output shaft 33 is formed in a flange shape projecting outward in the radial direction R <b> 2, and is fixed from the lower side to the central portion of the bottom wall 17 of the washing tub 4. Thereby, the washing tub 4 is connected to the third output shaft 33 so as to be integrally rotatable. Therefore, when the driving force of the motor 5 is transmitted to the third output shaft 33, the washing tub 4 is driven and rotated around the central axis J together with the third output shaft 33.

  Of the first output shaft 31, the second output shaft 32 and the third output shaft 33 arranged coaxially, and the peripheral portion of the through hole 15 through which these output shafts are inserted in the bottom wall 13 of the water tank 3, Between adjacent members, a bearing 34 such as a rolling bearing or a sliding bearing, and a seal member 35 such as an oil seal are inserted. The third output shaft 33 and the washing tub 4 are supported by the bearing 34 so as to be rotatable around the central axis J by the water tub 3, and are adjacent to each other among the first output shaft 31, the second output shaft 32, and the third output shaft 33. Objects can rotate relative to each other around the central axis J. The sealing member 35 prevents the washing water accumulated in the water tub 3 and the washing tub 4 from leaking below the bottom wall 13.

  A transmission mechanism 36 is accommodated inside the cylindrical third output shaft 33. The speed change mechanism 36 is mechanically connected to each of the first output shaft 31, the second output shaft 32, and the third output shaft 33. As the speed change mechanism 36, a known speed change mechanism such as a planetary gear mechanism can be employed. The first output shaft 31 and the second output shaft 32 are connected to the clutch mechanism 28 via the speed change mechanism 36. As a result, the driving force of the motor 5 is transmitted to the first output shaft 31 and the second output shaft 32 via the clutch mechanism 28 and the speed change mechanism 36. Then, each of the first output shaft 31 and the second output shaft 32 is driven and rotated around the central axis J. However, the second output shaft 32 rotates at a higher speed than the first output shaft 31 by the speed change mechanism 36.

  The 1st rotary blade 6 is what is called a pulsator, for example, is resin. The first rotor blade 6 has a central axis that coincides with the central axis J, and is formed in a thin disk shape in the vertical direction. A plurality of stirring blades 6 </ b> A that extend radially from the central axis J and swell in a streak shape are formed on the upper surface of the first rotary blade 6. The first rotary blade 6 is provided on the bottom portion 4 </ b> A of the washing tub 4, and specifically, is disposed in the washing tub 4 so as to overlap the bottom wall 17 from above. Therefore, a flat space S is formed in the lower part of the washing tub 4 so as to be sandwiched between the first rotary blade 6 and the bottom wall 17 from above and below. By fixing the center part of the 1st rotary blade 6 to the upper end part 31A of the 1st output shaft 31, the 1st rotary blade 6 is connected with the 1st output shaft 31 so that integral rotation is possible. Therefore, when the driving force of the motor 5 is transmitted to the first output shaft 31, the first rotary blade 6 is driven and rotated around the central axis J together with the first output shaft 31.

  The second rotary blade 7 is made of, for example, metal, has a central axis that coincides with the central axis J, and is formed in a thin disk shape in the vertical direction. A through hole 7 </ b> A is formed at the center of the second rotary blade 7. A plurality of rib-like pumping blades 7B projecting downward and extending radially from the through holes 7A are formed on the lower surface of the second rotary blade 7. Each pumping blade 7B may extend linearly along the radial direction R, or may be curved toward the radially outer side R2. The 2nd rotary blade 7 is arrange | positioned in the space S between these in the state which is not in contact with both the washing tub 4 and the 1st rotary blade 6. FIG. The central portion of the first rotary blade 6 and the upper end portion 31A of the first output shaft 31 are inserted through the through hole 7A of the second rotary blade 7 with play. In the second rotary blade 7, the portion around the through hole 7 </ b> A is fixed to the upper end portion 32 </ b> A of the second output shaft 32, so that the second rotary blade 7 is connected to the second output shaft 32 so as to be integrally rotatable. Is done. Therefore, when the driving force of the motor 5 is transmitted to the second output shaft 32, the second rotary blade 7 is driven and rotated around the central axis J. As described above, since the second output shaft 32 rotates at a higher speed than the first output shaft 31, the second rotary blade 7 rotates at a higher speed than the first rotary blade 6 connected to the first output shaft 31. . Specifically, the rotational speed of the second rotary blade 7 is preferably set to be 1.5 times or more and 2.8 times or less the rotational speed of the first rotary blade 6.

  The guide portion 8 has a bowl shape extending downward along the side wall 16 of the washing tub 4 over the range from the balance ring 19 to the bottom wall 17 and is made of, for example, a resin. It is formed in an arc shape that is convexly curved toward the inner side R1. The guide portion 8 is fixed to the side wall 16 so as to cover one place on the circumference of the side wall 16 from the radially inner side R1. Thereby, between the guide part 8 and the side wall 16, a guide path 37 extending downward from the top of the side wall 16 to the bottom wall 17 is formed in the washing tub 4. An opening 8A that penetrates the guide portion 8 in the radial direction R and a lid 8B that opens and closes the opening 8A are provided at the upper end portion of the guide portion 8. The lid 8B is connected to the guide portion 8 via a rotation shaft 8C passing through the lower end portion. The lid 8B rotates between a closed position in which the opening 8A is closed along the guide portion 8 as indicated by a solid line and an open position in which the opening 8A is opened by being drawn out radially inward R1 as indicated by a broken line. It can be rotated around the axis 8C. When the lid 8B is in the open position, the upper end portion of the guide path 37 is opened from the opening 8A to the radially inner side R1 and upward as the input portion 37A. The lower end portion of the guide path 37 is curved toward the radially inner side R1 and connected to the space S from the radially outer side R2. A plurality of guide portions 8 may exist, and in this case, a plurality of guide paths 37 are also provided.

  The cover portion 9 has a bowl shape extending upward from the lower end portion of the side wall 16 of the washing tub 4 to the front side of the balance ring 19, and is made of, for example, a resin. It is formed in a circular arc that is convexly curved. The cover portion 9 is fixed to the side wall 16 so as to cover a portion of the side wall 16 that is separated from the guide portion 8 in the circumferential direction P from the radially inner side R1. Thereby, between the cover part 9 and the side wall 16, the pumping path 38 extended upwards from the lower end part of the side wall 16 to the front of the balance ring 19 in the washing tub 4 is formed. The lower end portion of the pumping path 38 is curved toward the radially inner side R1 and connected to the space S from the radially outer side R2. The lower end of the pumping path 38 is an inlet 38 </ b> A communicating with the space S. A through hole 9 </ b> A that penetrates the cover portion 9 in the radial direction R is formed at the upper end portion of the cover portion 9. A portion of the upper end portion of the pumping path 38 exposed from the through hole 9A to the radially inner side R1 is an outlet 38B. The outlet 38B is disposed at a position higher than the inlet 38A and the first rotary blade 6 in the washing tub 4, and faces the radially inner side R1. A plurality of cover portions 9 may exist, and in this case, a plurality of pumping paths 38 are also provided.

  FIG. 2 is a block diagram showing an electrical configuration of the washing machine 1. The washing machine 1 further includes a control unit 40, a detection unit 41, a display operation unit 42, a water supply unit 43, a water level sensor 44, and a drainage unit 45. The control unit 40 is configured as a microcomputer including, for example, a CPU 46, a memory 47 such as a ROM or a RAM, and a timer 48, and is incorporated in the housing 2. The control unit 40 is electrically connected to the motor 5, the detection unit 41, the display operation unit 42, the water supply unit 43, the water level sensor 44, and the drainage unit 45.

  The control unit 40 controls the drive of the motor 5 to rotate the washing tub 4, the first rotary blade 6 and the second rotary blade 7, or stop these rotations. Further, when the clutch mechanism 28 described above is electric, the control unit 40 controls the clutch mechanism 28, thereby controlling the motor for each of the washing tub 4, the first rotary blade 6, and the second rotary blade 7. 5 can be transmitted or cut off. The detection unit 41 is configured to detect the rotation speed of the motor 5, strictly speaking, the rotation speed of a rotor (not shown) in the motor 5, and is configured by, for example, a Hall IC. The rotation speed of the motor 5 detected by the detection unit 41 is input to the control unit 40 in real time.

  The display operation unit 42 is provided on the surface of the housing 2 and includes a switch, a liquid crystal panel, and the like. The control unit 40 receives an operation of the display operation unit 42 by the user, displays necessary information on the display operation unit 42 so as to be visible, and gives a buzzer by the display operation unit 42. The water supply unit 43 includes at least the water supply valve 24 described above. The controller 40 opens or closes the water supply valve 24 to supply water into the water tub 3 and the washing tub 4 or stop water supply. The water level sensor 44 is a known sensor that detects the water level of the water tub 3, that is, the water level of the washing tub 4. The drainage part 45 includes at least the drainage valve 25 described above. The control unit 40 opens or closes the drain valve 25 to drain the water tank 3 and the washing tank 4 or stop draining.

  Next, the washing operation executed by the control unit 40 in the washing machine 1 will be described. With reference to the flowchart of FIG. 3, the washing operation includes a washing step (step S1) for washing the laundry Q accommodated in the washing tub 4, and a rinsing step (step S2) for the laundry Q after the washing step. And a dehydrating step (step S3) for dehydrating the laundry Q after the rinsing step.

  The washing process will be described with reference to FIGS. 1 and 4. When the user inputs the laundry Q from the insertion port 18 and stores it in the washing tub 4 and operates the display operation unit 42 to instruct the start of the washing operation, the control unit 40 receives this instruction ( In step S11), the amount of the laundry Q in the washing tub 4 is detected as a load amount (step S12). The control unit 40 may detect the load amount using a dedicated sensor (not shown), or may detect the load amount based on, for example, variations in the number of rotations of the motor 5 when the washing tub 4 is rotated at a constant speed. Good. The control unit 40 acquires the prescribed amounts of the necessary detergent and tap water according to the current load amount. These specified amounts are collected for each load amount and stored in the memory 47 in advance. The control unit 40 displays the prescribed amount of detergent according to the current load amount on the display operation unit 42. In the washing process, the regular concentration of water in the washing tub 4 up to the specified amount determined according to the amount of load this time and then washing the laundry Q, and a predetermined concentration of detergent in tap water significantly less than the specified amount And concentrated washing using a concentrated washing liquid produced by dissolving to the extent of Note that the instruction from the user in step S11 may include an instruction for selecting whether or not to perform concentration cleaning.

  The control unit 40 that has detected the load waits for the user to insert the detergent (step S13). The user, referring to the display on the display / operation unit 42, prepares a predetermined amount of detergent, opens the door 11 and rotates the lid 8B to the open position, and then introduces the detergent 37A. Is introduced into the conduit 37. Then, the introduced detergent flows down the guide path 37 and is guided to the space S between the bottom wall 17 of the washing tub 4 and the first rotary blade 6 (see the thick dashed arrow in FIG. 1). Thus, the guide path 37 is a direct path for guiding the detergent to the space S. Next, when the user rotates the lid 8B to the closed position and then closes the door 11, the introduction of the detergent is completed. For example, when the controller 40 detects that the door 11 is closed by a sensor (not shown), the controller 40 determines that detergent has been introduced (YES in step S13), and enters the water tub 3 and the washing tub 4 by the water supply unit 43. Water supply is started (step S14).

  When the water level in the washing tub 4 rises to a predetermined water level lower than the water level at the above-mentioned prescribed amount due to the water supply, the above-described concentrated washing liquid is completed in the space S and its surroundings. Whether the washing liquid is completed is monitored based on the water level in the washing tub 4 (step S15). The predetermined water level here is, for example, a water level corresponding to 50% of the water level at a specified amount. When the concentrated laundry liquid is completed, that is, when the controller 40 generates the concentrated laundry liquid in the space S by supplying water less than the specified amount in this way (YES in step S15), the water supply is stopped and the concentrated cleaning is performed. Start (step S16). Specifically, the control unit 40 rotates the first rotary blade 6 and the second rotary blade 7 by the motor 5 while the concentrated washing liquid is accumulated in the space S.

  During the concentration cleaning, the laundry Q on the first rotary blade 6 in the washing tub 4 is stirred by coming into contact with the stirring blade 6A of the rotating first rotary blade 6. Further, the concentrated washing liquid in the space S is pushed out to the radially outer side R2 by the pumping blades 7B of the rotating second rotary blade 7 and sent to the inlet 38A of the pumping path 38, and ascends the pumping path 38 from the outlet 38B. It is spread | dispersed on the laundry Q in the washing tub 4 (refer the thick solid line arrow of FIG. 1). When the concentrated washing liquid pumped up from the space S into the pumping channel 38 and returned into the washing tub 4 from the outlet 38B penetrates into the laundry Q by the pump-up effect by the second rotary blades 7, the laundry Q Dirt is broken down by high concentrations of detergent components in the concentrated laundry liquor. The concentrated washing liquid that has permeated into the laundry Q oozes out of the laundry Q in the washing tub 4 and then flows down to the space S. Thereby, the concentrated washing liquid circulates from the space S so as to return to the space S through the pumping path 38 and the laundry Q.

  In the concentration cleaning, the laundry Q in the washing tub 4 is agitated by the rotation of the first rotary blade 6, so that the laundry Q is cleaned by the mechanical force from the first rotary blade 6. Further, the concentrated washing liquid is vigorously circulated through the pumping path 38 by feeding the concentrated washing liquid to the inlet 38 </ b> A of the pumping path 38 by the second rotating blade 7 rotating at a higher speed than the first rotating blade 6. However, the laundry Q in the washing tub 4 is repeatedly bathed. Thereby, all the laundry Q is strongly washed by the high concentration detergent component in the concentrated laundry liquid. As a result, the cleaning power can be improved.

  The control unit 40 monitors the elapsed time from the start of the concentration cleaning with the timer 48. When the first washing time has elapsed from the start of the concentrated washing (YES in step S17), the detection unit 41 confirms whether or not the current rotational speed of the motor 5 has reached the specified rotational speed (step S18). If the rotation speed of the motor 5 is equal to or higher than the specified rotation speed, the concentrated washing liquid is being circulated at such a speed that the laundry Q can be sufficiently washed because the second rotary blade 7 is rotating at a high speed. On the other hand, if the rotational speed of the motor 5 is less than the specified rotational speed, the rotational speed of the second rotary blade 7 is low, so that the concentrated washing liquid has a low momentum and stays in the space S without being circulated in some cases. is there. If the rotation speed of the motor 5 is equal to or higher than the specified rotation speed (YES in step S18), the control unit 40 continues the concentration cleaning (step S19). When the second washing time has elapsed from the start of the concentration cleaning (YES in step S20), the control unit 40 stops the concentration cleaning by stopping the motor 5 (step S21).

  After the completion of the concentration cleaning, the control unit 40 stores water in the washing tub 4 as the final water supply until the specified amount is reached (step S22). Thus, since the remaining water corresponding to the difference between the water supply amount before the start of the final water supply and the specified amount is added to the washing tub 4, the concentration of the detergent in the washing liquid in the washing tub 4 is the concentrated laundry liquid. Lower than the detergent concentration at And the control part 40 stops water supply, starts normal washing | cleaning, and rotates the 1st rotary blade 6 and the 2nd rotary blade 7 with the motor 5 (step S23). In normal cleaning, the laundry Q soaked in a large amount of washing liquid accumulated up to a specified amount is agitated by the rotating first rotating blade 6 or the normal concentration of washing liquid circulated by the rotation of the second rotating blade 7 is bathed. It is washed by being. When the third washing time has elapsed from the start of normal washing (YES in step S24), the control unit 40 stops the normal washing by stopping the motor 5, and thus the washing process is completed.

  However, depending on the setting of the second washing time, when the concentrated washing is continued until the second washing time, the laundry Q may be sufficiently washed. Therefore, when the rotation speed of the motor 5 during the concentration cleaning has increased to the specified rotation speed (YES in step S18), the control unit 40 continues the concentration cleaning for a predetermined time until the second cleaning time (step S18). You may complete | finish a washing process, without performing final water supply (step S22) and normal washing | cleaning (step S23 and S24) in S20. In this case, water can be saved in the washing process, so that even with a small amount of water supply, the maximum washing power can be exhibited by concentrated washing.

  When the washing process is completed, the control unit 40 drains the water tub 3 and the washing tub 4 by the drainage unit 45. In the rinsing process after draining (step S2), the control unit 40 accumulates tap water in the washing tub 4 and rotates the first rotary blade 6 and the second rotary blade 7 to generate a water flow. The laundry Q in 4 is rinsed by the water flow. The rinsing process may be performed a plurality of times. When the rinsing process is completed, the control unit 40 drains the water tub 3 and the washing tub 4 by the drainage unit 45. In the dehydration step after drainage (step S3), the control unit 40 rotates the washing tub 4 at a high speed with the drain valve 26 of the drainage unit 45 opened. Thereby, the moisture in the laundry Q exudes by centrifugal force, and the laundry Q is dehydrated.

  On the other hand, the rotational speed of the motor 5 at the time when the first washing time has elapsed because the laundry Q becomes the resistance of the first rotary blade 6 due to the large load amount of the laundry Q in the washing tub 4. However, it may be insufficient and may not increase to the specified rotational speed. In this case, since the rotation speed of the second rotary blade 7 does not increase, it is difficult to circulate the concentrated washing liquid vigorously and put it on the laundry Q. Therefore, when the rotation speed of the motor 5 at the time when the first washing time has elapsed does not increase to the specified rotation speed (NO in step S18), the control unit 40 counts in advance related to the concentration cleaning. The value is referred to (step S25).

  The count value is a value stored in the memory 47 and reset to zero each time the concentration cleaning is completed. When the first cleaning time has elapsed, the rotation speed of the motor 5 is less than the specified rotation speed. Incremented (+1). If the current count value is less than a predetermined value such as “3” (YES in step S25), the control unit 40 increments the current count value and temporarily stops the motor 5 for concentration. Washing is interrupted, and additional water supply is performed within a range where the amount of water in the washing tub 4 does not reach the specified amount (step S26). That is, when the rotation speed of the motor 5 during the concentration cleaning does not increase to the specified rotation speed, the control unit 40 performs additional water supply as a retry process.

  After the additional water supply, the control unit 40 restarts the concentration cleaning after stopping the water supply (step S16), and performs the processing after step S17. The additional water supply raises the water level in the washing tub 4 in a range where the concentration of the detergent in the concentrated washing liquid does not drop more than necessary, so that the laundry Q is floated to reduce the resistance of the first rotary blade 6, that is, the burden on the motor 5. be able to. Therefore, the 2nd rotary blade 7 can be rotated at high speed by raising the rotation speed of the motor 5 during concentration washing | cleaning to a regulation rotation speed. In this case, the concentrated washing liquid in which the detergent is dissolved at a high concentration although it is slightly diluted by the additional water supply can be continuously circulated and put on the laundry Q. As a result, even if the initial resistance of the first rotary blade 6 is excessive due to the large amount of laundry Q in the washing tub 4, the cleaning power can be improved. In step S18 after resuming the concentrated cleaning, the control unit 40 checks whether or not the rotational speed of the motor 5 has reached the specified rotational speed when the first cleaning time has elapsed since the resumption of the concentrated cleaning. Is done.

  If the rotation speed of the motor 5 does not reach the specified rotation speed even after the concentration cleaning is restarted and the count value finally increases to 3 (NO in step S25), the control unit 40 forcibly ends the concentration cleaning (step S25). After S21) and final water supply (step S22), normal cleaning is performed (step S23). If the number of rotations of the motor 5 during the concentration cleaning after the additional water supply does not increase to the specified number of rotations, the additional concentration of the additional water supply will dilute the concentrated laundry liquid to a normal concentration that cannot be said to be a concentrated laundry liquid. Therefore, there is a possibility that the original concentrated cleaning effect cannot be obtained. Therefore, the control unit 40 stops the concentration cleaning in this way (step S21), performs additional water supply until the amount of water in the washing tub 4 reaches a specified amount (step S22), and then the first rotating blade 6. Then, normal cleaning for rotating the second rotary blade 7 is performed (step S23). Thereby, the laundry Q can be normally washed with the stirring by the rotation of the first rotary blade 6 and the washing liquid in which the detergent is dissolved to the normal concentration. After performing normal cleaning until the third cleaning period has elapsed (YES in step S24), the control unit 40 ends the cleaning process.

  The present invention is not limited to the contents of the above embodiments, and various modifications can be made within the scope of the claims.

  For example, the washing machine 1 may be a washing / drying machine having a function of drying the laundry Q. In the embodiment described above, the washing machine 1 is a vertical type in which the central axis J of the washing tub 4 extends in the vertical direction, but the washing tub 4 is arranged so that the central axis J intersects the vertical direction. May be.

DESCRIPTION OF SYMBOLS 1 Washing machine 4 Washing tub 4A Bottom part 5 Motor 6 1st rotary blade 7 2nd rotary blade 17 Bottom wall 18 Slot 37 Passage path 38 Pumping path 40 Control part 41 Detection part 43 Water supply part Q Laundry S Space

Claims (4)

A laundry tub having a laundry inlet and a bottom wall opposed to the inlet from the lower side, containing laundry put in from the inlet, and a washing tub in which washing liquid is stored from the bottom wall side;
A first rotary blade provided at the bottom of the washing tub and stirring the laundry in the washing tub by rotating;
A conduit that extends downward in the washing tub and guides the detergent into a space between the bottom wall and the first rotary blade in the washing tub;
A pumping path provided in the washing tub, for pumping the washing liquid in the washing tub from the space and returning it to the washing tub;
A second rotary blade that is disposed in the space and feeds the washing liquid in the space into the pumping channel by rotating at a higher speed than the first rotary blade;
A motor for rotating the first rotary blade and the second rotary blade;
A water supply unit for supplying water into the washing tub;
After the detergent is supplied to the conduit, the water supply unit supplies water that is less than a predetermined amount, thereby generating a concentrated washing liquid in which the detergent is dissolved to a predetermined concentration in the space, and then the first rotary blade by the motor. And a control unit that performs concentration cleaning for rotating the second rotary blade. A detector that detects the number of rotations of the motor;
2. The washing machine according to claim 1, wherein, when the rotation speed of the motor during the concentration cleaning does not increase to a specified rotation speed, the control unit supplies additional water by the water supply unit.   If the rotation speed of the motor during the concentration cleaning after the additional water supply does not increase to the specified rotation speed, the control unit stops the concentration cleaning, and the amount of water in the washing tub is set to the specified volume. The washing machine according to claim 2, wherein after the additional water is supplied by the water supply unit until the amount is reached, normal washing is performed by rotating the first rotary blade and the second rotary blade by the motor.   In a case where the rotation speed of the motor during the concentration cleaning increases to a specified rotation speed, the control unit ends the cleaning process without performing the normal cleaning after continuing the concentration cleaning for a predetermined time. Item 4. A washing machine according to Item 3.

Images